191 



HEREICK TO HAREIS. 



New Haven, Oct. 19, 1841. 



As you will of course need a description of tlie insect [Hes- 

 sian Fly], I give you the following, Avhicli I made long ago, 

 and which I now extract from a copy of my letter dated Jan. 

 • 10, 1834, to Dr. C. E. Hammerschmidt, of Vienna. 



?. A7itennce corporis dhnidii longltudine, porrectce, moniUformes, teretes, 

 verticUlato-piloscB, 17-19 articulatoi : artlculus primus turhinaliis, secundus 

 globosus, sequentes ovati non pedicellad. Caput parvum; oculi mar/ni, lunati, 

 niffri, confluentes. Thorax gibbus, nif/er, politus. Abdomen fulvum, pilis 

 atris ; ovipositor roseus. Pedes elongafi, Jiliformes, tarsorum arliculus basalts 

 perbrevis. Alee atro-pilosce, basi fulvce., nervis trihus ; primus, ab alee origine 

 ad marginem anterioreni paullo idira medium recte tendlt; secundus ab alee 

 origine ad apiccm recte tendit; terlius obscurus (forsan spurius) ab alee 

 origine ad marginis posterioris medium flectus. Long. 12 poll. 



6. Antennae, fere corporis longitudine paullo recurvce ; arficuli 17-19 sub- 

 globosi, pedicellati. Abdomen elongatum, griseo-pilosum. Pupa elongato- 

 ovata, badia, glabra, undecim lineis transversis ; articulus posterior scepe 

 bifurcatus. Long. .12 poll. 



Larva hyalina, duabus lateralibus lacteo-albarum nubilarum seriebus. Ovum 

 }iyalinum,fulvescens,lineare. Long. .02 poll. 



I have an impression that in one of my recent letters I stated 

 that the eo;o; of the Hessian Fly hatches in about a fortnight 

 after it is laid. If I have said so it is an error ; it should be 

 about four days. The period will probably vary somewhat with 

 the state of the weather, but this is near the average. 



In regard to the Wheat Moth of the Middle States I might 

 have also referred to J. B. Bordlciy's Essays and Notes on 

 Husbandry and Rural Affairs, Phil., 1799, 8vo, p. 591. He 

 says " the moth-fly described by Duhamel was extremely numer- 

 ous, common and destructive in every year," until about the year 

 1772, etc., p. 296. He gives no description of the insect. I am 

 inclined to think we have it here ; at any rate, on one occasion, 

 several moths flew out of a parcel of heads of wheat which I 

 had laid away and had accidently disturbed. I did not secure 



